Liberal arts graduates in the humanities and social science have an average salary of $26,271 directly out of college and $66,185 at the age of 56.

Students who major in pre-professional or professional programs have an average salary of $31,183 directly out of college and $64,149 at the age of 56.

Liberal arts majors attain advanced degrees at a higher level than students who majored in pre-professional or professional progams

Here is a taste of an article on the report at Inside Higher Ed:

Liberal arts majors may start off slower than others when it comes to the postgraduate career path, but they close much of the salary and unemployment gap over time, a new report shows.

By their mid-50s, liberal arts majors with an advanced or undergraduate degree are on average making more money those who studied in professional and pre-professional fields, and are employed at similar rates. But that’s just one part of the paper’s overall argument that concerns about the value of a liberal arts degree “are unfounded and should be put to rest.”

“That’s a myth out there – that somehow if you major in humanities, you’re doomed to be unemployed for the rest of your life. This suggests otherwise,” said Debra Humphreys, a co-author of the report and vice president for policy and public engagement at the Association of American Colleges and Universities. “That sort of journey to professional success is more of a marathon than a sprint.”